Wheel is a very important invention of man

THE WHEEL is often described as the most important invention of all time – it had a fundamental impact on transport and later on agriculture and industry. The wheel-and-axle combination was invented around 4500 BC and was probably first used for a potter's wheel.

The correct answer is B) The people involved with the study told the men that they were being treated for "bad blood."

The option that would be would be an acceptable paraphrase of the information is the following: The people involved with the study told the men that they were being treated for "bad blood."

The excerpt is referring to the unethical study conducted by the United States Public Service between 1932 and 1972. The name of the study was the Tuskegee Study of Untreated Syphilis in the Black Men. The cruelty of the study was that none of the 399 men that had syphilis were treated to cure the disease; they never received the penicillin necessary to be cured.